Exaggerated values in simulation results


#1

The project i am working on is a simple front wing, after creating the mesh and doing the simulation the values of the forces, drag and downforce are not realist.
https://www.simscale.com/projects/pgalamba/teste_7/
I thank you for the assistance.


#2

Hi @pgalamba,

I removed your “Tunel de Vento” and created the tunel from the “Background mesh box”. The refinement is not perfect but can be optimized if you like.

Give it a try and tell me if the quantities you are looking for are looking as expected:

Your Project

Let me know how the simulation goes.

Cheers,

Jousef


#3

I tried but the results are still too hight, is it a mistake in the simulation parameters?


#4

Hi @pgalamba.

That can also be a reason of course.

Can you give us a little bit more information about the parameters you are using and what values you would expect?

Thank you!

Jousef


#5

The material is air, (Initial conditions) the gauge pressure is 0, the velocity is 0, k is 0.00375, omega is 3.375.
The boundary conditions were:, inlet velocity: x=12 m/s, I indicated the freestream walls, I indicatetd the pressure outlet of 0. I also indicated thet the floor was moving at x=12 m/s. I also created a wall (no-slip) with the wing geometry. After that i just made the results to show only the forces.

The values I would espect would be in [50-90] N of downforce.
Thank you for your help.


#6

Hi @pgalamba, this is because of the size of your wing:

This is likely because you created in units other than meters, you will need to scale it.

Kind regards,
Darren


#7

Hey @pgalamba,

Just took a quick look at your project. The model you are using has been scaled up by a factor of 1000, hence the high unrealistic force values.

You may scale the geometry down by a factor of 0.001 on the Platform as follows:

  1. Create a new operation

  2. Define the Scaling Factor and start the Operation.

This should solve your issue :slight_smile:

Best,
Krishna


#8

I fill so stupid. I will try that right away. thank you so mutch


#9

Thanks for jumping in that fast @1318980 & @kcontractor !

@pgalamba: Practice makes perfect :slight_smile:

Cheers and good luck with your simulation!